Magnetic separator



July 24, 1 934. A. H. PEHRSON AL MAGNETIC SEPARATOR 2 sheets-sheet lFiled May` 27, 1952 alla. n

/llillll llllllllllll r f INVENTORS VN 5D Y V1 RTM H EN PEL. Rm WFL .Vamm HO MDM Am DI .AMELA 5 n N. m n A July 24, 1934. A. H. PEHRsoN ET ALl 1,967,723

MAGNETIC SEPARATOR 2 Sheets-Sheet 2 Filed May 27, 1952 Patented July 24,1934 STATES 1,967,723 MAGNETIC sEPARAToR Adam Helmer Pehrson,

Olof Eugen Tydn, Stockriksborg, and Einar helm, Sweden Normas, OskarFred- Application May 27, 1932, Serial No. 614,130 In Sweden April 30,1331 8 Claims.

This invention relates to devices for separating pulverous ore o1'material containing other stuffs, which are inluenced by magnetism bywhich, also the separation of weak magnetic stuff is rendered possibleby the wet process, which hitherto has been considered impossible.

rhe present improvement comprises apparatus in which a current of waterwith stuff suspended therein is caused to pass over the upper part of adrum rotating around a horizontal axis, the said drum attracting themagnetic constituents of the stun" by means of magnetic influence andcarrying the same down out of the path of current in order to let themdown into a collecting device at a certain point where the magneticiield of the drum is weakened.

The accompanying drawings show diagrammatically two embodiments ofdevices for carrying out the abovementioned process.

Figure l shows a vertical section of such a separating device and Figure2 shows a cross section of a device comprising a plurality of separatingapparatus placed one after the other.

In the device shown in Figure l, 3 indicates an electromagnet, thepole-pieces 1 and 2 of which magnetize a rotatable tween them. The saiddrum consists preferably of a core 5, surrounded by discs 6, separatedfrom each other. The pole-pieces 1 and 2 are tapered towards or embracethe drum according as a ield of a rather small or great intensity orextension is wanted. Further the pole-pieces tighten against side plates7, by which troughs `8 and 9 are formed for supplying and letting outthe stuff to be separated. The ends of the pole-pieces turned towardsthe drum i may preferably be adapted to be replaced and the upper sidesof the same are coated with wood, rubber or the like. Between thepole-pieces and under the drum, a chamber is formed by the plates 10 andthe side plates 7, the drum rotating between the last mentioned plates.The said chamber, in which the drum is partly immersed, is divided intotwo sections 13 and 14. by the partitions 11 and 12. The partitionstighten against the periphery of the drum. l5. 16 and 17 indicatesupplies for water and 18 and 19 outlets for the stui. An adjustabledistributor 20 for the stun" rests against the drum and a conveyer 21 islocated in the trough 8 for feeding the stuit to the drum Ll. 22 and 23indicate the wire windings of the electromagnet. 24, 25 and 26 indicategrooves thru which the magnetic and ion-magnetic stul is carried awayafter the separation. The conveyer 21 and the drum 4 are driven byYmeans of the belt drives 27, 28 and 29.

The apparatus operates in the following manner:

drum 4 located be-v The material to be separated, which is suspended inwater, lows in the trough 8 over the pole-piece l towards the drum 4.Thereby the magnetic portion of the material will new closer to thebottom of the trough than the rest of the material, partly on account ofthe magnetic attraction, partly on account of the greater specificgravity of the magnetic material. In order to secure a conveying of thematerial without using disturbing inclination of the trough and of thepole-piece the conveyer 21 is used. The material proceeds further acrossthe drum, the magnetic portion being intercepted on the mantle of thedrum and carried on the same, according to the direction of rotation ofthe drum, either to and thru the opening 30 located between thepolepiece 1 and the drum or to and thru the opening 31 located betweenthe pole-piece 2 and the drum. In the said openings the material is metby a current of water ascending from the chamber 13 and 14 respectively,preventing the non-magnetic part of the material from following in thedirection of rotation or" the It the drum rotates against the directionin which the material is carried in the trough 8 the magnetic materialis caught by the drum and brought thru the opening 30 down into thechamber 14, which is illed with water all the time, and flows out thruthe outlet 18 and the groove 24. v

The non-magnetic material is carried by the water ascending thru theopening 30 across the drum to the pole-piece 2 and is carried awayeither thru the trough 9 and the groove 26, the opening 31 being thenkept closed, or is allowed to :flow down thru the opening 31 into thechamber 13, the remaining magnetic material being in the latter caseintercepted on the drum in the strong magnetic iield in the opening andcarried back to the opening 30. The supply of water to the drum 13 andle must always be larger than the quantity of water, which leaves thruthe outlets 18 and 19 in order that water may flow up thru the openings30 and 31, The pole-piece 1 is preferably located a little higher upthan the pole-piece 2.

If the drum rotates with the direction in which the material is carriedforward and if the opening 30 has been closed by means of a rubberplateor in some other way, or that so much water ascends thru theopening 30 that the material cannot come down into the room 14 this way,the material to be separated is brought over to the opening 31 by thewater and by the drum 4, the magnetic material being carried down thruthe said opening and let out thru the outlet 19 and the groove 25. Thenon-magnetic material is carried away by the water, ascending from thechamber 13, and leaves thru the 2 trough 9 and groove 26. During thepassage of the material across the drum the same is distributed alongthe drum by the distributor 20.

The drum 4 may rotate with such a great speed that some water containingnon-magnetic material is thrown away by the centrifugal force, whileanother part of the water is retained on the drum along with magneticmaterial intercepted on the same.

A separation may be obtained also in the magnetic held between thepole-piece 1 the drum rotating with the current or material, by acurrent of water being conducted upwards from the chamber 14 thru theopening 30, the said current of water being adapted in such a manner,that the non-magnetic material sinks down into the chamber 14, fromwhere it is removed thru the outlet 18. The magnetic ma teria-l isintercepted by the drum and brought to the opening 31 by same, where theseparation proceeds in the manner as described above.

The device shown in Figure 2 consists of three separating devicesmounted one after the other. The magnet cores 33, 34 and 35 are placedon a common abutment 32. 36, 3'7 and 38 indicate the wire windings ofthe magnets, winding 37 being twice as large as the two others. Thedrums 42 and 43 rotate between the pole-pieces 39, 40 and 41. The drum44 rotates in the same direction as the iiow of material and obtains asufficient quantity or" magnetism from the pole-piece 41 as to be ableto intercept strong magnetic material. For the rest the device isconstructed in the same way as the one described above, except that thedividing of the chamber located under the drum, which is at hand in theabove described device, is not to be found in the last mentioned device.Here by it will be sufficient to have only one supply and one outlet forthe water for each chamber, in addition to the two openings between drumand pole-pieces. The supplies are indicated by 45, 46 and 47 and theoutlets by 48, 49 and 50.

The mode of operation is as follows:

The suspended material enters the trough 51. Strong-magnetic material isintercepted by the drum 44 and weak-magnetic material is conducted onthe pole-piece 4l to the drum 43, after which the material notintercepted by the said drum is conducted on the pole-piece 40 to thedrum 42. The material which is not taken care of at the said drum iscarried away over the pole-piece 39 to the groove 52. The function ofthe single parts of the device might be clear from the device describedabove and shown in Figure 1.

Having now described our invention, what we claim as new and desire tosecure by Letters Patent is:

1. Apparatus for separating pulverous ore or other materials containingstuffs which are acted upon by magnetism, comprising a magnetic drumrotating on a horizontal axis, a trough extending close to one side ofthe drum for leading in a current oi water with said stuffs suspendedtherein, an outlet trough extending close to the other side or the drum,which troughs are shaped as pole pieces in order to magnetize the drum,said drum rotating toward one of said troughs and means provided formaintaining a supply of water under pressure acting from below in theintermediate space between the drum and the trough toward which the drumis rotating.

2. In an apparatus according to claim 1 means for maintaining a supplyof water under pressure acting from below in two adjacent intermediatespaces between the drum and the inlet and outlet troughs.

3. Apparatus according to claim l, wherein the troughs which are shapedas pole pieces partially surround the drum.

4. Apparatus according to claim 1, wherein the troughs which are shapedas pole pieces are tapered in vertical section towards the drum.

5. Apparatus for separating pulverous ore or other materials containingstuffs which are acted upon by magnetism, comprising a magnetic drumrotating on a horizontal axis, a trough extending close to one side ofthe drum for leading in a current of water with said stuffs suspendedtherein, an outlet trough extending close to the other side of the drum,there being one or more magnets provided below the inlet trough so as tocause the magnetic constituents of the supplied sturfs to mainly flowonward close to the 'bottom of the trough, and which troughs are shapedas pole pieces in order to magnetize the drum.

6. Apparatus for separating pulverous ore or other materials containingstuffs which are acted upon by magnetism, comprising two parallelmagnetic drums located close to and laterally oi each other and rotatingaround horizontal axes, one of the said drums being more magnetized thanthe other, said other drum being relatively less magnetized, an inlettrough for a current of water with said studs suspended therein eX-tending close to one side or the other drum which is less magnetized,and an outlet trough extending close to the drum which is moremagnetized, which troughs are shaped as pole pieces for magnetizing thedrums, and means provided for maintaining a supply of water underpressure acting from below in the intermediate space between the drums.

7. Apparatus for separating puverous ore or other materials containingstuis which are acted upon by magnetism, comprising the combination of amagnetic drum rotating on a horizontal axis, an external electromagneticpole piece disposed at each of the opposite sides or the drum in orderto magnetize the same and extending close to said drum so as to presentslits between the pole pieces and the periphery oi the drum, while theuppermost portion or said periphery remains free and unobstructed, meansfor leading a current of water with aforesaid stui's suspended thereintothe drumv over one of the pole pieces at one side of the latter, meansfor leading separated material away from the drum over the other of saidpole pieces at the other side of said drum, and means for maintaining asupply of water under pressure acting from below the drum in at leastthe Vone slit located at the outlet side of the latter.

8. An apparatus according to claim 7, having a charging trough, andwherein at least one of the magnetic pole pieces cooperates with saidtrough in order to form means for subjecting the material supplied tosaid trough to influence of a magnetic iield in order to drawmagnetically attracted particles vto the bottom of said trough..

ADAM HELMER PEHRSON. EINAR OLOF EUGN TYDEN.

